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Subject: [OMPI users] OpenMPI program getting stuck at poll()
From: Prasanna Ranganathan (prasanna_at_[hidden])
Date: 2009-03-09 15:25:43

Hi all,

 I have a distributed program running on 400+ nodes and using OpenMPI. I
have run the same binary with nearly the same setup successfully previously.
However in my last two runs the program seems to be getting stuck after a
while before it completes. The stack trace at the time it gets stuck is as

 #0 0x00002ad0000c00df in poll () from /lib/
#1 0x00002acfffa49c27 in opal_poll_dispatch () from
#2 0x00002acfffa47add in opal_event_base_loop () from
#3 0x00002acfffa43203 in opal_progress () from /usr/lib64/
#4 0x00002acfff78b315 in ompi_request_test_some () from
#5 0x00002acfff7adf7a in PMPI_Testsome () from /usr/lib64/

I checked all the nodes and they seem to be up and doing fine. Any
suggestions/hints on what might be happening here would help greatly. Thanks
in advance.

I am using OpenMPI 1.2.7 on gentoo linux.